Dry-ore concentrator



2 Sheets-Sheet 1.

(No Model.)

0. F. JAOOBSON. DRY ORE GONOENTRATO'R.

No. 409,689. Patented Aug. 20, 1889p Inventor.- 6%

N. PETERS. PholwLdhogmplmr. Washinglnn, D. c.

(No Model.) 2 Sheets-Sheet 2 O. P.- JAGOBSON. DRY ORE GONGENTRATOR.

No. 409,589, Patented Aug. 20, 1889.

UNITED STATES PATENT OFFICE.

CHRISTIAN FREDERIK JACOBSON, OF SAN FRANCISCO, CALIFORNIA.

DRY-ORE CONCENTRATOR.

SPECIFICATION forming part of Letters Patent No. 409,589, dated August 20, 1889. Application filed January 23, 1883. Serial No. 261,600. (No model.)

To aZZ whom it may concern.-

Be it known that 1, CHRISTIAN FREDERIK JACOBSON, a citizen of the United States, residing in the city and county of San Francisco, and State of California, have invented certain new and useful Improvements in Dry Ore Concentrators; and I do hereby declare that the following is a full, clear, and exact description of my said invention, reference being had to the drawings that accompany and form part of this specification.

My invention relates to dry-ore concentrators of that class in which an air-blast is employed in conjunction with means for bringing the crushed ore into and through the blast.

My improvements embrace a novel e011- struction and combination of parts, as will hereinafter be set forth and claimed.

The nature of these said improvements and the manner in which I proceed to construct, apply, and operate the same are explained in the following description, in which the accompanying drawings are referred to by figures and letters.

Figure 1 represents my improved apparatus in side elevation. Fig. 2 is a vertical section throughthe air-receiveraud the pressureregulator. Fig. 3 is a horizontal section at about the line X X, Fig. 2. Fig. 4 is a side elevation of the eoncentrating-chamber. Fig. 5 is an elevation taken from the left-hand side of Fig. 4.. Fig. 6 is a cross-section taken through theline X X, Fig. 4. Fig. 7 is a horizontal section through the center of the chamber.

A represents a concentrating-chamber of the revolving-cylinder kind having spiral flanges for lifting and throwing the ore across the blast.

B is a fan or blower, and C is an air-receiving tank placed between the blower and the concentrating-chamber and connected with both by suitable conducting-pipes.

D is a pressure-regulator of such character as to secure and maintain a given degree of pressure. This construction of regulator will also be found useful in other apparatus Where the pressure of air or gases in a tank or receiver is to be controlled.

C is the air-receiving tank, and C the inlet to which the trunk or conductor of the blower is connected. C is the outlet from which the air is carried into the concentrating'chamber by means of a pipe C This tank is like an ordinary gasometer in form, excepting that a compartment C is made within the upper part, into which the conductor from the blower is carried, and from which the air passes into the tank through an opening C in the top. A valve D, seated under this opening, is balanced by having the tank-pressure against its under surface, and is connected positively by arod E to the float or inverted cylinder C, that forms the movable top of the tank. The valve-rod is fixed at the upper end in the head of the float, and is held by rollerguides F F at the lower end. The float is balanced in the usual way by means of cords and counter- Weights, and the lower end sets into a sealing-trough C containing water or other sealing-liquid. The vertical movements of the float, as the same take place under variations in the force or pressure from the blower, are thus made to increase or to contract the area of the opening through which the air passes from the compartment C into the tank proper, and by this means the pressure is kept uniform in the tank while the apparatus is Working. The tank-pressure against the back of the valve is admitted through apertures Gr in the horizontal partition H, that supports and forms the bottom of the receiving-compartment C. Communication between the tank and this compartment is out off, except through the valve-opening, by the sealingtrough H, which is set around them, into which the rim of the valve dips, the valve being cup-shaped and having a deep rim for this purpose. Any required degree of pressure can be obtained by placing additional weights Z on the top of the float. From the tank the air is carried by the pipe C into the end of the concentrating-chamber, and When the pressure is once regulated it Will be seen that it remains constant, so that whatever volume is taken into the tank the action within the chamber is uniform while the operation goes on.

Figs. 4 to 7, inclusive, show the construction of the cylinder in Which the concentration is carried on. The cylinder A is closed at one end by a head A, having a central opening A to let in the air-pipe, and also a discharge-opening K at or near the rim for the concentrates. The opposite end of the cylinder is left open except at the rim, where a flange A is fixed around the edge to retain the material as well as to stiffen the cylinder.

L is a spiral flange fixed against the interior surface of the cylinder in such manner as to form a continuous spiral channel or passage of uniform Width through it from end to end. This channel terminates at the closed end and at the opening A Intersecting this spiral, that runs circumferentially, are partitions M M, dividing the space or channel between one turn and the next and extending longitudinally through the cylinder. The face of each of the intersecting partitions is set acutely and at an angle of less than ninety degrees with the surface of the cylinder, and also with an inclination from the horizontal, so that each one forms a slanting shelf having an inclination toward the discharge end of the cylinder. If these partitions are set in line, as shown in Fig. '7, they will form a continuous spiral running longitudinally from the feed end to the discharge end, but stopping at the last circumferential partition, so as to leave the last portion of the channel between the head and the spiral clear for discharge of the material through the outlet K.

The object of this construction is obvious. The

longitudinal partitions M, having their outer edges elevated and their surfaces pitching toward the discharge end, form receptacles that catch and carry up the ore in the rotary movement of the cylinder, and discharge their contents after passing-the center, each one into the neXt channel or that turn of the spiral passage which is in advance. The ore is not only dropped through the center of the cylind er-space, therefore, but is progressed or shot forward by virtue of the inclination of the partition. Regular progression, as well as continual lifting and dropping of the ore, is effected with the cylinder set horizontally. The material being treated is fed in at the end opposite to the blast by means of a suitable hopper and spoutP, and to secure the best results the cylinder is charged at intervals and not fed continuously.

It should be mentioned that the dotted lines in Figs. 5 and 6 indicate the leading ends of all the. partitions, of which there are thirty-two in the cylinder of the size herein shown. The number will depend upon the 7 diameter and length of the cylinder. They should be so arranged that the ore is dropped in successive order and not from more than one section or receptacle at the same moment. The inclination that the face of the partition makes with the axis of the cylinder, when brought by the rotation above the axis,

must be greater than the angle of repose.

This angle may be taken at about twenty-five degrees. The opening in thehead of the cylinder is surrounded with a funnel-shape rim R, and the area of the opening is somewhat larger than the pipe, so that a space is left around the pipe, through which the air from the outside is drawn in. The funnel will increase the intensity of the blast.

It will be obvious that this apparatus can be Worked by suction instead of by blast; but in such case it will be necessary to turn the cylinder end for end, so that the suction is applied at the same end as the feed, and the progression of the ore shall be contrary to the suction. The tank will then be a receiving chamber for the refuse matter that is drawn into it by the suction, and a draw-off outlet should be provided at the bottom of the chamber for cleaning out. No change will be required inv the regulating-valve; but the weights that are used to regulate the degree of pressure in the case of the blast will be applied at the end of a cord passing over pulleys and attached at the other end by a hook to the top of the float, as shown in Fig. 3.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is

1. In an ore-concentrator, the combination, with a blower and concentrator connected to the inlet of a pressure-regulator, of said pressureregulator consistin of two chambers having a double perforated partition between them, a sealing-trough on the upper chamber,

and a hood with its edges immersed in the sealing-trough, said hood having a stem, guiderollers for said stem, and a scaled valve connected thereto and exposed to the pressure of the lower chamber, substantially as set forth.

2. In an ore-concentrator, the combination of a support and a cylindrical rotatable concentrating-chamber placed in a horizontal position on said support and having a continuous spiral flange extending from end to end of the chamber, and aseries of oblique shelves extending from end to end of the chamber, as set forth.

In testimony that I claim the foregoing I have hereunto set my hand and seal.

CHRISTIAN FREDERIK JACOBSON. [L 8.]

\Vitnesses:

EDWARD E. OSBORN, CHAS. D. WHEAT.

ITO 

